I did the same upgrade over the weekend and ran into this same bug. I applied a variation of David Wilson's workaround.
I first booted on a 19.04 liveCD (downloaded from http://old- releases.ubuntu.com/releases/disco/), 20.04 liveCD also wouldn't boot (never tried the 19.10 liveCD), and then chrooted into my broken system using instructions from https://help.ubuntu.com/community/LiveCdRecovery#Update_Failure I added deb http://old-releases.ubuntu.com/ubuntu disco main restricted universe multiverse deb http://old-releases.ubuntu.com/ubuntu disco-updates main restricted universe multiverse deb http://old-releases.ubuntu.com/ubuntu disco-security main restricted universe multiverse To /etc/apt/sources.list, and created /etc/apt/preferences.d/grub with contents: Package: * Pin: release n=disco Pin-Priority: -10 Package: grub-common Pin: release n=disco Pin-Priority: 1000 Package: grub-efi-amd64 Pin: release n=disco Pin-Priority: 1000 Package: grub-efi-amd64-bin Pin: release n=disco Pin-Priority: 1000 Package: grub-efi-amd64-signed Pin: release n=disco Pin-Priority: 1000 Package: grub2-common Pin: release n=disco Pin-Priority: 1000 and then ran apt update apt upgrade which warned me about _downgrading_ grub, which is exactly what I want for the workaround. Until I remove the preferences file which pins the grub version I'm not in danger of overwriting the old grub packages on a regular upgrade. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853369 Title: [19.10] Boot hangs at "loading initial ramdisk" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1853369/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
